Fernox protection in a sealed CH system

[nichos]

In my old vented system I used to change the Fernox every 2 - 3 years.

How is it done with my new CH system?

Potterton Kingfisher M F 60 boiler, with an “OSO” Unvented Water heater.
Also has a second expansion vessel (Zilmet) with pressure gauge, a fully sealed system.

Thanx nick

 

[twgas]

and a mastic gun

 

[nichos]

Thanx, on filling it with Fernox method, do you have to drain away the system first, or just keep toping it up?

Nick

 

[LUNAT]

HI

it is better if you release water (not full)
then using filling loop attach the GUN through
non return valve and simply squezee the tube
into the system.remove GUN reconnect filling loop
and if necessary top up water ,bleed radiators and
run CH for about 20 minutes .

 

[nichos]

thanx LUNAT,

where / what is "Filling Loop"?, nick

 

[Goldspoon]

Or...

Drain some water out of the CH system using a downstairs rad or pipe with a drain point on. Drain enough so that when you "bleed" an upstairs rad you no longer get water coming out from the bleed point (because water level has dropped below the bleed point).

Then take out complete screw in fitting from rad that houses bleed screw using an adjustable spanner (or you can take out complete bung at other end top of rad).

Then I use this which I made earlier:

It's a funnel, a length of hose... and a brass part from a garden centre (one end fits onto hose and other end screws into rad).

Then pour inhibitor into funnel. Then, when done, put rad bung back in and refill system (bleeding as required).

Job done.

A lot cheaper to buy inhibitor via bottle than via the tube.

 

[GasMan1965]

Or even better is if you fit a magnaclean then it will help protect the system and boiler and its very handy for adding inhibitors and the like

 

[nichos]

Thanx again, will apply this info to suit the bangalow drop-down pipes to rads. nick